I. -isation /aɪzeɪʃ ə n $ əzeɪ-/ BrE AmE suffix
a British spelling of ↑ -ization
II. -ization BrE AmE ( also -isation British English ) /aɪzeɪʃ ə n $ əzeɪ-/ suffix
makes nouns from verbs ending in ↑ -ize :
civilization
crystallization
I. -isation /aɪzeɪʃ ə n $ əzeɪ-/ BrE AmE suffix
a British spelling of ↑ -ization
II. -ization BrE AmE ( also -isation British English ) /aɪzeɪʃ ə n $ əzeɪ-/ suffix
makes nouns from verbs ending in ↑ -ize :
civilization
crystallization
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012